Cummins testing shows it takes 140,000 miles to establish a good fuel mileage base. I'm still working on the 40,000 mile part!!
Maybe the engine will be broken in by the time my wife and I can retire!
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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